Polypropylene composition having improved scratch resistance

Abstract

The invention relates to a polypropylene composition comprising: (i) 30-97 wt. % of a polypropylene; (ii) 2-20 wt. % of a branched low density polyethylene with a density between 910 and 935 kg/m 3 and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; (iii) 1-20 wt. % of a copolymer of ethylene and a C 3 -C 20 α-olefin with a density between 840 and 890 kg/m 3 and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; and (iv) 0.5-60 wt. % of a filler, wherein wt. % are calculated on the total amount of the polypropylene composition.

1. A polypropylene composition comprising:
 (i) 30-97 wt. % of a polypropylene; 
 (ii) 2-20 wt. % of a long chain branched low density polyethylene with a density between 910 and 935 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; 
 (iii) 1-20 wt. % of a copolymer of ethylene and a C 3 -C 20 α-olefin with a density between 840 and 890 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; and 
 (iv) 0.5-60 wt. % of a filler,
 wherein wt. % are calculated on the total amount of the polypropylene composition. 
 
 
     
     
       2. The composition according to  claim 1 , wherein the amount of the branched low density polyethylene is between 5 and 15 wt. %. 
     
     
       3. The composition according to  claim 1 , wherein the density of the branched low density polyethylene is between 915 and 925 kg/m 3 . 
     
     
       4. The composition according to  claim 1 , wherein the branched low density polyethylene has a Melt Flow Index between 8 and 80 g/10 min. 
     
     
       5. The composition according to  claim 1 , wherein the amount of the copolymer of ethylene and a C 3 -C 20  α-olefin is between 1 and 18 wt. %. 
     
     
       6. The composition according to  claim 1 , wherein the copolymer of ethylene and a C 3 -C 20  α-olefin has a density between 860 and 880 kg/m 3 . 
     
     
       7. The composition according to  claim 1 , wherein the MFI of he copolymer of ethylene and a C 3 -C 20  α-olefin is between 0.1 and 10 g/10 min. 
     
     
       8. The composition according to  claim 1 , wherein the composition comprises between 60 and 80 wt. % of a polypropylene. 
     
     
       9. The composition according to  claim 1 , wherein the composition in addition comprises a slip agent. 
     
     
       10. The composition according to  claim 1 , wherein the amount of filler is 1-45 wt. %. 
     
     
       11. An article comprising a polypropylene composition comprising:
 (i) 30-97 wt. % of a polypropylene; 
 (ii) 2-20 wt. % of a long chain branched low density polyethylene with a density between 910 and 935 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; 
 (iii) 1-20 wt. % of a copolymer of ethylene and a C 3 -C 20  α-olefin with a density between 840 and 890 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; and 
 (iv) 0.5 -60 wt. % of a filler,
 wherein wt. % are calculated on the total amount of the polypropylene composition. 
 
 
     
     
       12. An interior automotive part comprising a polypropylene composition comprising:
 (i) 30-97 wt. % of a polypropylene; 
 (ii) 2-20 wt. % of a long chain branched low density polyethylene with a density between 910 and 935 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; 
 (iii) 1-20 wt. % of a copolymer of ethylene and a C 3 -C 20  α-olefin with a density between 840 and 890 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; and 
 (iv) 0.5 -60 wt. % of a filler,
 wherein wt. % are calculated on the total amount of the polypropylene composition. 
 
 
     
     
       13. The composition according to  claim 1 , wherein the amount of filler is more than 5 wt. % and less than 45 wt. %. 
     
     
       14. The composition according to  claim 4 , wherein the polypropylene has a Melt Flow Index between 10 and 100 g/10 min. 
     
     
       15. A polypropylene composition consisting essentially of:
 (i) 30-97 wt. % of a polypropylene; 
 (ii) 2-20 wt. % of a long chain branched low density polyethylene with a density between 910 and 935 kg/m 3  and a Melt Flow Index (MF 1 ) between 0.1 and 100 g/10 min; 
 (iii)  1 - 20  wt.% of a copolymer of ethylene and a C 3 -C 20  a-olefin with a density between 840 and 890 kg/m 3  and a Melt Flow Index (MFI) between 0.1 and 100 g/10 min; and 
 (iv) 0.5 -60 wt. % of a filler,
 wherein wt. % are calculated on the total amount of the polypropylene composition.